Apparentely it's only considered a dependence and not an addiction, even though there are a lot of discussions about it.
Pathologically reinforced caffeine use induces dependence, but not an addiction.[13] For a drug to induce an addiction from repeated use at sufficiently high doses, it must activate the brain's reward circuitry, particularly the mesolimbic pathway.[13]
https://removepaywalls.com/www.newscientist.com/article/2580374-ais-solution-to-87-year-old-riddle-takes-mathematicians-by-surprise/
Whenever there is a paywall, insert "removepaywalls.com/" before the link